public function get_with_parents($id=NULL,$single=FALSE){
$this->db->select('pages.*','p.slug as parent_slug','p.title as parent_title');
$this->db->join('pages as p','pages.parent_id=p.id','left');
return parent::get($id,$single);
}

$this->data ['pages'] = $this->Page_model->get_with_parents();